Add Space Between Date and Time (2 posts)

my post date code is <div class="post-date"><?php the_time('j M Y H i'); ?></div> and it will show for exmple : 14 apr 2013 11.30. how to create space between the date (14 apr 2013) and time (11.30) so it can show like this : 14 apr 2013___11.30 ??
i'm new in wordpress and i dont know anything about php so please somebody help me :(